Back in January, a vet did an internal exam for pregnancy of my mare that I purchased from a horse trader back in the fall. He said she was pregnant and due sometime in May. I had the barn vet come out and give her vaccinations Friday, and she said my mare wasn't pregnant. The mare looks pregnant and her bag is starting to change dropping down more, even though it is not filling up with milk. Over the last week, her body has gotten a little larger each day. The mare has not been "in season" over the last six months that I have had her, even with a stallion in the area. Could the second vet be wrong? Has anyone else ever had a situation like this? Thanks for any advice you can give.